package com.snsprj.netty;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import java.net.InetSocketAddress;

/**
 * @author SKH
 * @date 2018-10-31 15:42
 **/
public class EchoClient {

    private final String host;

    private final int port;

    public EchoClient(String host, int port){
        this.host = host;
        this.port = port;
    }

    public void start() throws InterruptedException {

        EventLoopGroup group = new NioEventLoopGroup();

        try {
            Bootstrap bootstrap = new Bootstrap();

            bootstrap.group(group).channel(NioSocketChannel.class)
                    .remoteAddress(new InetSocketAddress(host, port))
                    .handler(new ChannelInitializer<SocketChannel>() {

                        @Override
                        protected void initChannel(SocketChannel socketChannel) throws Exception {
                            socketChannel.pipeline().addLast(new EchoClientHandler());
                        }
                    });

            ChannelFuture future = bootstrap.connect().sync();
            future.channel().closeFuture().sync();
        }finally {

            group.shutdownGracefully().sync();
        }
    }

    public static void main(String[] args) throws InterruptedException {

//        if (args.length != 2){
//            System.err.println("Usage: " + EchoClient.class.getSimpleName() + " <host> <port>");
//        }
//
//        String host = args[0];
//        int port = Integer.parseInt(args[1]);

        String host = "127.0.0.1";
        int port = 8000;

        new EchoClient(host, port).start();
    }
}
